A mediated immune response that is effective against extracellular antigens, such as bacteria, viruses, and toxins when they are outside the cell is called antibody.
<u>What is an</u><u> antibody</u><u>?</u>
An antibody is a protein-based element of the immune system that travels through the blood and detects and destroys foreign entities like bacteria and viruses. Antibodies remain in circulation in the blood after exposure to an antigen, acting as a defense against additional exposures to that antigen.
A component of the host cell's defense is the antibody. It is produced by a particular kind of white blood cell known as a B cell. Two light chains and two heavy chains make up the antibody's structure, and at its very tip is a hypervariable area that enables the antibody to produce a variety of antibodies that will react to all of the antigens that may attack the body.
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